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<Title>White Round Meters</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">White Round Meters</p>
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<div class="content">
<img src="images/whiteroundmeter0.png" width='250' height='250'>&nbsp;&nbsp;<img src="images/whiteroundmeter1.png" width='250' height='250'>&nbsp;&nbsp;<img src="images/whiteroundmeter2.png" width='250' height='250'>&nbsp;&nbsp;<img src="images/whiteroundmeter3.png" width='250' height='250'>&nbsp;&nbsp;<img src="images/whiteroundmeter4.png" width='250' height='250'>&nbsp;&nbsp;<img src="images/whiteroundmeter5.png" width='250' height='250'>
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This example demonstrates round meters with a soft white background and a silver border.<br><br>
The white background in this example is actually a radial gradient. It is fully white at the center, changing to light grey at the border. This creates a "softer" white effect. The radial gradient is created using <a href="AngularMeter.relativeRadialGradient.htm">AngularMeter.relativeRadialGradient</a>.<br><br>
The silver border effect is achieved by using <a href="AngularMeter.relativeLinearGradient.htm">AngularMeter.relativeLinearGradient</a> to create a gradient consisting of varying levels of grey. The gradient is used as the fill color of the border ring created using <a href="AngularMeter.addRing.htm">AngularMeter.addRing</a>. The edge color of the ring is set to grey to make it easier to distinguish from the white background.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/whiteroundmeter.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%!
// Function to create the demo charts
void createChart(WebChartViewer viewer, int chartIndex)
{
    // The value to display on the meter
    double value = 72.3;

    // Create an AngularMeter object of size 250 x 250 pixels with transparent background
    AngularMeter m = new AngularMeter(250, 250, Chart.Transparent);

    // Set the default text and line colors to dark grey (0x333333)
    m.setColor(Chart.TextColor, 0x333333);
    m.setColor(Chart.LineColor, 0x333333);

    // Demonstration two different meter scale angles
    if (chartIndex % 2 == 0) {
        // Center at (125, 125), scale radius = 111 pixels, scale angle -140 to +140 degrees
        m.setMeter(125, 125, 109, -140, 140);
    } else {
        // Center at (125, 125), scale radius = 111 pixels, scale angle -180 to +90 degrees
         m.setMeter(125, 125, 109, -180, 90);
    }

    // Add a black (0x000000) circle with radius 123 pixels as background
    m.addRing(0, 123, 0x000000);

    // Background gradient color from white (0xffffff) at the center to light grey (0xdddddd) at the
    // border
    double[] bgGradient = {0, 0xffffff, 0.75, 0xeeeeee, 1, 0xdddddd};
    // Add circle with radius 123 pixels as background using the background gradient
    m.addRing(0, 123, m.relativeRadialGradient(bgGradient, 123));

    // Gradient color for the border to make it silver-like
    double[] ringGradient = {1, 0x999999, 0.5, 0xdddddd, 0, 0xffffff, -0.5, 0xdddddd, -1, 0x999999};
    // Add a ring between radii 114 and 123 pixels using the silver gradient with a light grey
    // (0xbbbbbb) edge as the meter border
    m.addRing(114, 123, m.relativeLinearGradient(ringGradient, 45, 123), 0xbbbbbb);

    // Meter scale is 0 - 100, with major/minor/micro ticks every 10/5/1 units
    m.setScale(0, 100, 10, 5, 1);

    // Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    // 12/9/6 pixels pointing inwards, and their widths to 2/1/1 pixels.
    m.setLabelStyle("Arial Italic", 15);
    m.setTickLength(-12, -9, -6);
    m.setLineWidth(0, 2, 1, 1);

    // Demostrate different types of color scales and putting them at different positions
    double[] smoothColorScale = {0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
        0xff0000};
    double[] stepColorScale = {0, 0x00cc00, 60, 0xffdd00, 80, 0xee0000, 100};
    double[] highLowColorScale = {0, 0x00ff00, 70, Chart.Transparent, 100, 0xff0000};

    if (chartIndex == 0) {
        // Add the smooth color scale at the default position
        m.addColorScale(smoothColorScale);
    } else if (chartIndex == 1) {
        // Add the smooth color scale starting at radius 62 with zero width and ending at radius 40
        // with 22 pixels outer width
        m.addColorScale(smoothColorScale, 62, 0, 40, 22);
    } else if (chartIndex == 2) {
        // Add the smooth color scale starting at radius 109 with zero width and ending at radius
        // 109 with 12 pixels inner width
        m.addColorScale(smoothColorScale, 109, 0, 109, -12);
    } else if (chartIndex == 3) {
        // Add the high/low color scale at the default position
        m.addColorScale(highLowColorScale);
    } else if (chartIndex == 4) {
        // Add the smooth color scale at radius 44 with 16 pixels outer width
        m.addColorScale(smoothColorScale, 44, 16);
    } else {
        // Add the step color scale at the default position
        m.addColorScale(stepColorScale);
    }

    // Add a text label centered at (125, 175) with 15pt Arial Italic font
    m.addText(125, 175, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.Center);

    // Add a readout to some of the charts as demonstration
    if ((chartIndex == 0) || (chartIndex == 2)) {
        // Put the value label center aligned at (125, 232), using white (0xffffff) 14pt Arial font
        // on a dark grey (0x222222) background. Set box width to 50 pixels with 5 pixels rounded
        // corners.
        TextBox t = m.addText(125, 232, m.formatValue(value,
            "&lt;*block,width=50,halign=center*&gt;{value|1}"), "Arial", 14, 0xffffff, Chart.BottomCenter)
            ;
        t.setBackground(0x222222);
        t.setRoundedCorners(5);
    }

    // Add a red (0xff0000) pointer at the specified value
    m.addPointer2(value, 0xff0000);

    // Output the chart
    viewer.setChart(m, Chart.SVG);
}
%&gt;
&lt;%
// This example includes 6 charts
WebChartViewer[] viewers = new WebChartViewer[6];
for (int i = 0; i &lt; viewers.length; ++i) {
    viewers[i] = new WebChartViewer(request, "chart" + i);
    createChart(viewers[i], i);
}
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;White Round Meters&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        White Round Meters
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here are the chart images ****** --&gt;
    &lt;%
        for (int i = 0; i &lt; viewers.length; ++i) {
            out.write(viewers[i].renderHTML(response));
            out.write(" ");
        }
    %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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